Topher crampton



a sneerksneet 1; 0 N.

Patented Dec. 2, 1890.,

(No Model.)

T. P. G..ORAMPT ELEGTRIGARG'LAM 3 Sheets-Sheet 2.

(No Model.)

T. P. G. BRAMPTON.

ELECTRIC-ARC LAMP.

Patented Dec. 2, 1890.

mi NORRIS PETERS 120., mow-mun WASHINGTON, u. c.

T. P. 0; ORAMPTON. ELECTRIC. ARC LAMP.

3 Sheets-Sheet 3.

(No Model.)

Patiented Dec. 2, 1890.

UNITED STATES PATENT OFFICE.

THOMAS P. O. CRAMPTON, OF LONDON, ENGLAND, ASSIGNOR OF ONE-HALF TO ALBERT ESSINGER, OF SAME PLACE.

ELECTRIC-ARC LAMP.

SPECIFICATION forming art of Letters Patent No. 442,018, dated December 2, 1890.

Application filedtluly 14, 1890. Serial No. 358,649. (No model.) Patented in England July 1, 1889,No'.10,640; in Belgium July 4, 1890,1lo. 91,138, and in ItalyAugust 5,1890, LIV, 425,

To aZZ whom it may concern: L and so strengthens the downward attrac- Be it known that I, THOMAS PHILLIP OHRIS- tion. TOPHER ORAMPTON, a citizen of England, re The outer tube E has fixed to its lower end siding at Oursitor Street, Chancery Lane, a cross-piece M, (see plan, Fig. 1,) to'which are 5 London,in the county of Middlesex, England, attached the hooks J J, and pieces N N of any 5 5 have invented certain new and useful Imsuitable shape forming the frame of the lamp. provements in Electric-Arc Lamps, (for which The pieces N N are insulated from the cross-' I have obtained patents in GreatBritain,dated piece M, and are joined at their lower extremi- July 1, 1889, No. 10,640; in Belgium, dated ties to the lower-carbon tube B. When the IO July 4, 1890, No. 91,138, and in Italy, dated lamp is put in circuit, the solenoid K lifts the August 5, 1890, Vol. LIV, 425,) of which the upper carbon, striking the are. following is a specification. To the top of the carbon-tube B is attached This invention relates to the construction by screwing or by a bayonet catch or hinge of a simple, cheap, compact, and efficient eleca ring or crown 0, (shown in detail in Figs. 3

.15 trio-arc lamp. and 3%) having a number (preferably three) Figures 1, 2, 1, and 2 are front and side of studs 0 o 0 of platinum, iridium, or other elevations, respectively, of oneform of my inrefractory alloy so adjusted that they rest vent-ion,certain parts beingsupposedrenioved outside of the are on the cone form ed at the for the sake of clearness. top of the lower carbon as it consumes. The

20 It consists, essentially, of two tubes A and crown is slotted between the studs to allow B, within which carbon or other electrodes escape of detached particles of carbon. slide freely. The upper one of these tubesA The upward feed of the lower carbon is has fixed to it a hollow iron core D,which effected by means of a weight P, connected slides freely inside an outer tube E, the weight bya chain Q, passing over a pulley to a metal 2 5 of the tube, core, and other attachment-s being piece R, sliding freely inside the tube B and counterbalanced by springs EE. The tube pushing the lower carbon continually against A carries at its lower end a cross-piece F, to the studs 0 0 0. Between the metal piece R the outer edges of which are pivoted clutchand the base of the carbon is interposed a pieces G G, and a spring H, regulated by a conoidal piece S of porcelain or other insu- 3o screw-nut I, presses the jaws of the clutchlating material, which can project through piecesGGagainst the carbonOuntil the tube the studs 0 0 0 when the lower carbon is A,with the cross-piece F and the clutch-pieces burned out, thus breaking the are without G G, descends, so that the tails of the clutch damaging the studs. pieces rest on catch-hooks J J, whose length The slot T of the tube B is for the purpose 3 5 is regulated by the screws and nuts, as shown. of withdrawing the piece R laterally, so that When this occurs, the grip of the clutch-pieces the lower carbon can be introduced or with- G G is relieved and the carbon slides downdrawn through the open bottom of the tube B. ward between them. U is a guard-plate having a central hole,

The descent of the tube A, as the upper carthrough which the upper carbon passes With- 40 bon consumes and the consequent feed of the out contact. This plate prevents the passage 0 upper carbon, is effected in the ordinary way upward of heat and particles of carbon. It by the action of the differential coils K and is preferably made of two thicknesses of metal L, suitably placed on the outer tube E, K bewith asbestus between them, and itis attached ing a coil of thick wire in circuit with the to but insulated from the frames N N.

45 carbons, and L a coil of line wire in shunt to V and V are the terminals, which may be 5 the lamp-circuit. The increased length of placed where convenient on the frame, both are due to the consumption of the carbons insulated from the cross-piece M, but one 1V causes less current to pass through K and so in metallic connection with the frame N and weakens the upward attraction of the core D, so with the lower carbon.

50 while it causes more currentto pass through The weight 1? may, if desired, be placed holes in each clutch-piece.

above the framesN N as a ring outside the coils K and L, being connected by chains or cords passing over pulleys to the piece R.

Only one clutch-piece G,with one re1ieving- 5 hook J, may be used in combination with a fixed jaw forming part of the cross-piece F. Any known clutch may be attached to the carbon-tube A, if it is so constructed that the grip is released when the tube descends bere low a certain point determined according to the desired length of arc. The arrangement may be reversed by fixing the clutch to the cross-piece M and attaching the releasinggear to the tube A, as shown in Figs. 5, 6, 7,

I5 8, and 9.

Fig. 5 is a side view. Fig. 6 is a plan of the plate f. Fi 7 is a plan showing the clutches and counter-balance.

In Fig. 5, M is the cross-piece attached to the outer tube E, andfis the cross-piece attached to the carbon-tube A. g g are the clutch-pieces, which are pivoted at a a to arms I) Z), which are pivoted at c c and carry adjustable connterbalance-weights (Z d. The

clutch-pieces g g are loosely jointed to slotted holes of a link 6, which prevents them from separating. j j are adjust able releasing-studs. The connecting-piece k, attached to the crosspiece f, passes through corresponding half- (See plan, Fig. '7.) The action of this clutch is as follows: \Vhilc the arc is not too long, the clutclrpieces are drawn upward, resting on the head of the connecting-piece 713, and the weights (Z cl are raised upward, pressing the clutch-pieces against the carbon. WVhen, on the contrary, the arc lengthens, the tube A descends until the releasing-studs jj bear against the arms Z Z, whereupon the grip on the carbon is re- 40 leased, allowing the carbon to descend, shortening the arc.

Another form of clutch attached to the cross-piece M is shown in section by Fig. 8, and in plan by Fig. 9.

The clutch-pieces g g are attached to the cross-piece M by flat springs 72 7t, small studs 7'' j limiting their range. The connectingpiece it passes through the two half-holes in g g, as shown in Fig. 9. \Vhen, then, the tube A rises, the connecting-piece 71L, draws up the clutch-pieces g g and the fiexure of the springs h 7L causes 9 g to grip the carbon. lVhen, 011 the contrary, A descends in consequence of the lengthening of the arc, the springs it h draw back the clutch-pieces g 9, allowing the carbon to slip downward.

Having thus described the nature of my invention and the best means I know for carrying the sameinto practical effect, I claim 1. In an electric-arclamp, the combination, with apair of differential solenoids and adjustable stops, of an upper-carbon-holding tube having at its upper end a tubular iron core sliding in the solenoids and provided at its lower end with spring-clutch jaws acted on by the adjustable stops to release the carbon, substantially as described.

2. In an electric-arc lamp, the combination, with the outer tube carrying adjustable stops, of the inner carbon-holding tube carrying pivoted spring-clutches having tailpieces acted on by the adjustablestops to swing the clutches on their pivots and release the carbon, substantially as described.

3. In an electric-arc lamp, the combination, with an outer tube having a crosspiece carrying pendent stop-hooks, of the inner earbon-holding tube having a cross-piece carrying pivoted spring-clutches provided with tail-pieces which are acted upon by the stophooks to swing the clutches 011 their pivots and release the carbon, substantially as dc scribed.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 2d day of July A. D. 1890.

THOMAS P. (J. CRAMPTON.

\Vitnesses:

OLIVER IMRAY, Patent Agent, 28 SouHiamp/mi lauiltli'ngs,

London, W.

J NO. P. M. MILLARD, Clerk to .Mcssrs. Abel d: Intro 1 Consulting Engineers and Patent Agents, 98 Southampton Buildings, London, TV. (f. 

